Problem Statement Top K Frequent Words LeetCode Solution – Given an array of strings words and an integer k, return the k most frequent strings. Return the answer sorted by the frequency from highest to lowest. Sort the words with the same frequency by their lexicographical order. Example Test Case 1: Input: words = [“i”,”love”,”leetcode”,”i”,”love”,”coding”] k = 2 Output: [“i”,”love”] Explanation …
Problem Statement String Compression LeetCode Solution – Given an array of characters chars, compress it using the following algorithm: Begin with an empty string s. For each group of consecutive repeating characters in chars: If the group’s length is 1, append the character to s. Otherwise, append the character followed by the group’s length. The compressed string …
Problem Statement Bitwise AND of Numbers Range LeetCode Solution – Given 2 numbers left and right that represent the range [left, right], we have to find bitwise AND of all the numbers from left to right (both inclusive) Examples & Explanation Example 1: Input: left = 5, right = 7 …
Problem Statement The Missing Number LeetCode Solution – “Missing Number” states that given an array of size n containing n distinct numbers between [0,n]. We need to return the number which is missing in the range. Example: Input: nums = [3,0,1] Output: 2 Explanation: We can easily observe that all the …
Problem Statement The Best Time to Buy and Sell Stock LeetCode Solution – “Best Time to Buy and Sell Stock” states that You are given an array of prices where prices[i] is the price of a given stock on an ith day. You want to maximize your profit by choosing …
Consider a sorted array but one index was picked and the array was rotated at that point. Now, once the array has been rotated you are required to find a particular target element and return its index. In case, the element is not present, return -1. The problem is generally …
We will discuss Text Justification LeetCode Solution today Problem Statement The problem “Text Justification” states that you are given a list s[ ] of type string of size n and an integer size. Justify the text such that each line of text consists of size number of characters. You can …
We are given an array A[] on size n. We have to find the smallest element that is repeated exactly k times in the array. Example Input A[]= {1, 2 ,2 ,5 ,5 ,2 ,5} K=3 Output Smallest element with frequency K is: 2 Approach 1: Brute force Main idea …
In pair of positive negative values in an array problem we have given an array A of distinct integers, print all the pairs having positive value and negative value of a number that exists in the array. We need to print pairs in order of their occurrences. A pair whose …
In Insert Delete GetRandom problem we need to design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the set if present. getRandom: Returns a random element from the current set …